METHOD OF PRODUCING COMPOSITE POLYMER MEMBRANE FOR SEPARATION OF CARBON DIOXIDE FROM GAS MIXTURES Russian patent published in 2000 - IPC

FIELD: chemical industry. SUBSTANCE: invention deals with polymer composite gas-separating membranes used in separation of carbon dioxide from moist gas mixtures including its mixtures with nitrogen and oxygen. The method includes formation on anisotropic membrane from polyvinyltrimethylsilane on diffusion layer of covering layer from polyvinyl butyral or its mixture with polymers containing slightly basic aromatic or aliphatic aminogroups. Covering layer includes, wt.%: polyvinyl butyral, 20-100; polymer with amino groups, 0-80; with layer thickness with which permeability of two-layer composite membrane for carbon dioxide is not exceeding 600 l/sq.m.h.abs.atm. The method produces selective membrane for separating carbon dioxide from moist gas mixture and preserved its separating properties for long time. EFFECT: higher efficiency. 7 tbl, 7 ex